Dataset Information

Highly Efficient Uptake of TcO₄ ^- by Imidazolium-Functionalized Wood Sawdust.

ABSTRACT: ⁹⁹Tc is a radioactive fission product, mainly in the form of TcO₄ ^-, with good solubility and mobility in the environment. The development of effective and inexpensive materials to remove TcO₄ ^- from nuclear industry wastewater or contaminated water is significant. Wood sawdust is a byproduct of the wood processing industry and is an abundant, low-cost, and sustainable material. The mesostructure of wood consists of numerous hollow cells that are joined endwise to form an interconnected channel matrix capable of rapid transfer of ions. Imidazolium-functionalized wood sawdust (IM-WS) was synthesized using natural wood sawdust by a two-step reaction. It has excellent properties of TcO₄ ^-/ReO₄ ^- adsorption including rapid adsorption dynamics (30 s to equilibrium), good adsorption stability (pH 3-9), high selectivity (adsorption of 45.4 Re % in 1000 times excess of NO₃ ^- ions, 76.6 Re % in 6000 times excess of SO₄ ^2- ions, and 92.2 Tc % in a simulated mixed solution; after adsorption, the concentration of TcO₄ ^- decreased to 0.056 ppb from the initial concentration of 12.09 ppb in 1000 times excess of SO₄ ^2-), and in particular low production costs. These characteristics give it great prospects for low-level radioactive wastewater treatment and environmental remediation.

SUBMITTER: Dong F

PROVIDER: S-EPMC8495850 | biostudies-literature | 2021 Oct

REPOSITORIES: biostudies-literature

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Publications

Highly Efficient Uptake of TcO4 - by Imidazolium-Functionalized Wood Sawdust.

Dong Fangfei F Li Xiaomin X Huang Yiwei Y Zhi Xupeng X Yang Suliang S Shen Yinglin Y

ACS omega 20210923 39

99Tc is a radioactive fission product, mainly in the form of TcO4 -, with good solubility and mobility in the environment. The development of effective and inexpensive materials to remove TcO4 - from nuclear industry wastewater or contaminated water is significant. Wood sawdust is a byproduct of the wood processing industry and is an abundant, low-cost, and sustainable material. The mesostructure of wood consists of numerous hollow cells tha ...[more]

PMID: 34632223

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Project description:99Tc is one of the most problematic fission products in the nuclear fuel cycle owing to its large inventory in used nuclear fuel, long half-life, potential radiation hazard, high environmental mobility of its major species 99TcO4 -, and its redox-active nature. Ideally, 99TcO4 - should be removed at the first stage, when the used fuel rods are dissolved in highly concentrated nitric acid solution, which can substantially reduce its interference with the solvent extraction process through catalytic redox reactions with the key actinides and diminish the chance of discharge into the environment as the volatile species during the waste vitrification process. However, this task cannot be achieved by any of the reported anion-scavenging materials including traditional polymeric anion-exchange resins, inorganic cationic framework materials, and recently developed cationic metal-organic framework materials, because they either are not stable under the extreme conditions of the combined high acidity and strong radiation field or do not possess the required uptake selectivity towards 99TcO4 - in the presence of a huge excess of competing anions such as NO3 - and SO4 2-. Herein, we present the first study of 99TcO4 - removal under extreme conditions by a two-dimensional conjugated cationic covalent organic framework material, SCU-COF-1. This material exhibits ultrahigh acid stability, great resistance towards both large-dose β and γ irradiation and unprecedented 99TcO4 - uptake capabilities including extremely fast sorption kinetics (sorption equilibrium can be reached within 1 min), ultrahigh uptake capacity (702.4 mg g-1 for the surrogate ReO4 - at a slightly elevated temperature), and good anion-exchange selectivity towards 99TcO4 -. These excellent features endow SCU-COF-1 with the practical capabilities of separating 99TcO4 - from both simulant highly acidic fuel reprocessing solutions (3 M nitric acid) and low-activity waste streams at the US legacy nuclear site. The anion-exchange mechanism and the 99TcO4 - uptake selectivity are further demonstrated and clearly visualized by the molecular dynamics simulation investigations.

Dataset Information

Highly Efficient Uptake of TcO₄ ^- by Imidazolium-Functionalized Wood Sawdust.

Publications

Highly Efficient Uptake of TcO<sub>4</sub> <sup>-</sup> by Imidazolium-Functionalized Wood Sawdust.

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